GracieMag.com was the first to report the signing, and MMAjunkie.com (www.mmajunkie.com) has since confirmed the new deal with organization officials.

Strikeforce Director of Communications Mike Afromowitz told MMAjunkie.com that while he could not divulge the full details of Souza's deal, the contract was of the multi-fight variety, and he did expect a fall debut from the 29-year-old.

Souza's past five appearances have been for the Japanese-based DREAM organization, a group with which Strikeforce is reportedly working on finalizing an "alliance," according to recent comments by Strikeforce CEO Scott Coker on "The Carmichael Dave Show."

Souza is currently expected to face Jason "Mayhem" Miller at October's DREAM.11 for the organization's vacant middleweight title. Afromowitz was unable to confirm whether or not that bout was in jeopardy.

GracieMag.com's report cites a potential Oct. 25 Strikeforce debut for Souza, a date the outlet states will also feature the organizational debut of recent signing Fedor Emelianenko. The report also states Fresno, Calif., is a likely location for the as-yet-unannounced event.

Afromowitz was unable to offer any information on the likelihood of the potential event.

Souza, who fought four times for DREAM in 2008, made his lone U.S. appearance in May of 2007. "Jacare" submitted Bill Vucick at the Gracie Fighting Championships in Ohio, a card that also featured Fredson Paixao, Demian Maia, Matt Brown, Vinny Magalhaes, Nissen Osterneck, Phil Cardella, Rafael Dias, Thomas Denny and Chris Brennan, among others.

A multiple-time world Brazilian jiu-jitsu champion, Souza has earned nine of his 10 career MMA wins by submission.